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H. B. DIERDORFP.

MINING MAGHINB. No. 574,402. Patented Jan. 5, 1897.

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'- H. B. DIBRDORFF.

MINING MAGHINE; l

No. 574,402. Patented Jan. 5, 1.897.

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UNITED STATES vPATENT OFFICE.

'HENRY B. DIERDORFF, OF COLUMBUS, OHIO, ASSIGNOR TO JOSEPH A. JEFFREY,OF SAME PLACE.

MINING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 574,402, dated January5, 1897.

Application filed March 8, 1892. Serial No. 424,153. (No model.)

To all whom it muy concern:

Be it known that I, lHENRY BEECHERDIER- DORFF, a citizen of the UnitedStates, residing at Columbus, in the county of Franklin and State ofOhio, have invented certain newand useful Improvements inMining-Machines, of which the following is a specificatiomreferencebeing had therein to the accompanying drawings.

Figure l is a plan view of a machine embodying my improvements. Fig. 2is a longitudinal section on the line az' as', Fig. 1 Fig. 3 is a View,partly in rear elevation and partly in cross-section, on the line fy'y,Fig. 1. Figs. 4 and 5 are similar sections of the modified form of themachine.

The object of this invention is to provide an improvement in machinesfor mining coal wherein use is made of a bed, a carriage moving to andfro onr the bed, a cutting apparatus on the carriage, and shafting andgearing on the carriage for actuating the cutting mechanism and formoving the carriage. Considerable trouble and inconvenience have beenexperienced in moving the carriages of these machines, particularly inreceding the cutter and the carriage after a cut has been made, themechanism for this being ordinarily called the pull-back.

Prior to my invention use had been made of an intermittingly-actingmechanism as a pull-back, comprising a ratchet and dog actuated by aneccentric and connecting-rod, as is shown in Patent No. 299,655 to B. A.Legg, dated June 3, 1884, and use had also been made of sprocket-Wheelsand a chain, as is also shown and described in the said patent, and,again, use has been made of a train of gear-Wheels extending back fromthe intermediate shaft to the carriage-moving shaft. Serious objectionswere found to be incident to each of these constructions, theratchetand-dog mechanism having arr intermittent jerking action, thechain-and-sprocket mechanism acting too rapidly, it not being practical:in these machines as ordinarily made to get the room for a largesprocket-wheel Wherewith to properly reduce the speed, and the train ofgear-wheels being liable to clog or choke With slack and occupyingconsiderable of the restricted room.

One of the objects of the presentinvention is to provide a continnously-moving pull-back mechanism in conjunction with acontinuously-moving advancing mechanism, which pull-back mechanism shallcomprise parts 0f such nature and so related to the other parts that anydesired speed can be obtained in receding the carriage withoutmultiplying the number of the parts to such an extent as to seriouslytake up the limited space which is available.

The invention also relates to other matters of construction andarrangement, which will be readily understood from the drawings and thedescription given below.

The invention is applicable to machines of any of the numerous sorts,although particularly so to one of the class illustrated in the saidPatent No. 299,655, to which reference is herein made, and havingselected one of that class for purposes of illustration it is notnecessary to here give a detailed description of the machine as a Whole,but I will mention a number of them, so that the essential parts ofthepresent invention will be clearly understood.

A A represent the side bars of the bed; B B, the sliding side bars ofthe carriage fitted to the bed 5 B' B', the carriage-plate fitted tobars B B; O C, the engines; D D, the engine plates or supports; E, thecrank-shaft; F, the intermediate shaft; G, the rear chainshaft, shafts EF G being geared together in the usual way; G', the cutter-bar,connected by chains to shaft G; H, the rear transverse carriage-movingshaft, having pinions fitted in the rack H'; J, thelongitudinally-arranged carriage-advancing shaft, having the wormwheeljengaging With worm j' on intermediate shaft F and having worm L at itsrear end engaging with worin-Wheel N, loose on shaft H, and N', a clutchsplined to shaft H and adapted to engage with Worm-wheel N.

Referring to Figs. l, 2, and 3, the improved mechanism for withdrawingor pulling vback the carriage is shown as being constructed and arrangedas follows: Upon the shaft J and at a short distance from the Wormthereon is a bevel-wheel p', which meshes with a bevelwheel p, keyedupon the end 0f a shaft P, which is mounted in bearings and arrangedparallel to the transverse carriage -moving shaft H. Upon the saidcarriage-moving shaft H is a straight spur-wheel Q, loose thereon andcontinuously rotated by a similar wheel P, fast upon the said shaft P.Although the said wheel Q is loose upon the shaft I-I, yet it is adaptedto be rigidly connected thereto by the clutch N. Then the clutch is inengagement with the wheel N, the carriage advances slowly, and when itis in engagement with the wheel Q the carriage is moved in the oppositedirection at a higher speed, proportional to the relative sizes of thewheels p, p, P, and Q. By varying the relative dimensions of any ofthese wheels any necessary variations in the speed in this pull-backmechanism can be attained, such variation being necessary in order toproperly work upon different materials. By taking the power from thebevel-wheel p' on the lower end of shaft J the pull-back mechanism isarranged low down and its parts are compact and take but little room. Itis continuously in operation, and I therefore avoid the serious troublemet with in using an intermittingly-acting mechanism, such as a ratchetand pawl. Prolonged and extensive experience has demonstrated thatmachines of this class must have their parts arranged within restrictedlimits in' order that the machine may be easily portable, the powerproperly applied to the cutters, the parts be of small number, and theenergy of the engines economically transmitted. Thus the wheels at N andQ cannot well be over a foot in diameter or thereabout. The wheel Nshould make anywhere from one to three revolutions while the crank-shaftis making six hundred to one thousand and the intermediate shaft fromthree hundred to fivehundred, the shaft J revolving at about the rate ofthirty revolutions a minute. Then the wheel Q in the pull-back should atthe same time make from eight to ten revolutions a minute. .As thechain-shaft makes from one hundred and fifty to two hundred and fiftyrevolutions a minute and the wheel Q being of such small diameter, thedifficulty in reducing the speed by such devices by a chain andsprocket-wheels will be readily appreciated, it being remembered thatthe shaft G is the slowest of t-he three power-shafts, revolving fromseven to ten times as fast as the shaft H should revolve, the shaft Frevolving from fteen to twenty times as fast; hence the employment ofthe bevel-gearing actuated by the shaft J and suitable gearing driventhereby and actuating thc carriage-moving shaft, the latter being ofgreat importance in these machines.

In Figs. 7 and S is shown a modification in which use is made of a chainand sprocketwheel instead of the spur-gearings Pl Q, there beingincident to such an arrangement many of the advantages incident to thatin Figs. 2 and 3.

The positions of the bevel-gearing, or the directions of the threadsatjj, will of course be properly related to get the right direction ofrotation of the sprocket-wheels and thc shaft H.

lfVhat I claim isl. In a mining-machine the combination with thestationary frame and the sliding frame, of the transversecarriage-moving shaf t II, the relatively fast-moving power-shaft, theintermediate shaft, the carriage-advancing mechanism consisting of theshaft J, the worm-wheel thereon engaging with a worm on the intermediateshaft, a worm-wheel on the carriage-moving shaft and a worm on saidshaft J for driving it, and the carriage-withdrawing mechanismhaving thecontinuouslyrotating pinion-Wheel on said shaft H, a shaft P having abevel-wheel driven by a bevelwheel on the shaft J, and gearingconnecting said shaftP with the wheel Q, substantially as set forth.

2. In a mining-machine, the combination with a stationary bed-frame andthe sliding frame, of the power-shaft, the intermediate shaft, and thereversible double-speeded carriage-moving shaft, the carriage-advancingmechanism having the shaft J driven by the intermediate shaft and havinga worm driving a worin-wheel on the carriage-moving shaft, and thecarriage-withdrawing mechanism consisting of a shaft parallel with thecarriage-moving shaft geared to the said shaft J, and the straightspur-gearing connecting said shaft J with the carriage-moving shaft,substantially as set forth.

3. The combination with astationary frame provided with a rack and asliding frame provided with a pinion to engage said rack, of a shaft H,a worm-wheel thereon, a shaft J provided with a worm for driving saidwheel, a wheel Q on said shaft H, a shaft P parallel with said shaft Hand having a bevel-wheel 29 driven by a bevel-wheel p on shaft J andgearing connecting said shaft P with said wheel Q, substantially as setforth.

4. The combination of the bed,the carriage, the chain-actuated cuttingapparatus on the carriage, the prime power-shaft, the secondary shaftdriven thereby, the chain-driving wheel connected to the chain-drivingshaft, a transversely-mounted reversible shaft having pinions engagingwith racks on the bed, a carriage-moving shaft, P, parallel to thepinion-shaft, a worm on the secondary shaft, a worm-wheel driventhereby, a relatively slow-moving gearing actuated by said wormwheel forturning the reversible shaft slowly in one direction, means forconnecting the worm-wheel to the carriage-moving shaft, P, therelatively faster straight spur-gearin g connecting said carriage-movingshaft with the pinion-shaft, and the clutch, substantially as set forth.

5. The combination of the bed,the carriage, the chain-actuated cuttingapparatus on the carriage, the prime power-shaft, the reversibledouble-speeded carriage-moving shaft mounted transversely on thecarriage, the pinions thereon, the racks on the bed, the

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shaft slowly in one direeti on or rapidly in the ro opposite direction,substantially as set forth.

In testimony whereof I aiiix my signature in presence of two witnesses.

HENRY B. DIERDORFF.

lVitnesses:

A. RUPPERSBERG, W. E. RICH.

